public marks

PUBLIC MARKS with tags science & flash

2008

VLF Radio Signals

by rike_
The source of most natural radio signals is lightning. When a lightning bolt strikes, a massive amount of charge is moved and this acts in much the same way as moving charge in a radio transmitting antenna. The frequencies emitted by lightning range from 0 Hz to over 100 kHz with all frequencies being emitted simultaneously with the visible flash of lightning.

2007

2006

2005

Cassini-Huygens

by François Hodierne
La mission expliquée en animation.

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